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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261d6fcdb58d7a222925c9fba9684d79d2f4a45789a90aa38707f171257361e2' 
  AND token = 'WulTTO6y3NY/+/sX0yjPL2/Ubx4ilaDmcVNQOteX9E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}